{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4EU3921-0BE00-0A","brand":"Siemens","brandSlug":"siemens","productSlug":"4EU3921-0BE00-0A","canonicalUrl":"https://aoctrl.com/siemens/4EU3921-0BE00-0A","factsUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0BE00-0A","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 4EU3921-0BE00-0A commutating choke for converter, 3-phase, 380 V AC, 342 A rated, 380 A max, 50 Hz, 0.14 mH, IP00, flat-type terminals.","salesMarkdown":"The Siemens 4EU3921-0BE00-0A is a commutating choke (line reactor) designed for use with power converters — specifically a 3-phase choke rated for 380 V AC at 50 Hz. Its primary job is to limit the rate of current rise (di/dt) and smooth commutation notches on the converter's input or DC link, protecting the semiconductor bridge from excessive switching stress. Rated at 342 A continuous with a maximum of 380 A. The 0.00014 H inductance at 50 Hz with a 7.5% relative inductive voltage drop. At DC the rated current climbs to 465.6 A. This is an open-frame (IP00) component — no enclosure, no finger-safe shrouding. The flat-type terminals (flat connector) on the main current circuit are designed for bus-bar or large-lug connections, not DIN-rail terminal blocks. Physical footprint: 0.41 m wide × 0.385 m tall × 0.229 m deep. Total power loss is 434 W in the coil plus 186 W in the iron core. Thermal class H (180 °C) winding insulation per IEC 60085 means the choke can run hot without degrading the magnet wire — appropriate for the 40 °C ambient rating and the high copper losses. The 342 A rated current at 380 V AC drives the conductor sizing and the upstream protective device. This is not a 380 A part for continuous duty — the 380 A is the maximum (short-term overload), while 342 A is the continuous design point. A converter pulling 342 A RMS line current needs a choke this size; a smaller converter with a lower line current could use a lighter, cheaper reactor. The 7.5% inductive voltage drop means at rated current the choke drops voltage across its impedance.","metaTitle":"4EU3921-0BE00-0A Siemens Commutating Choke, 342 A, 380 V, 50","metaDescription":"Siemens 4EU3921-0BE00-0A commutating choke for converter. 3-phase, 342 A rated, 380 V, 50 Hz, IP00. Mature lifecycle. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Line/Load Reactors"],"specifications":{"Depth":"0.229m","Width":"0.41m","Height":"0.385m","Maximum":"380A","Rated Value":"342A","Phase number":"3","Type of voltage":"AC","lifecycle_stage":"mature","at DC rated value":"465.6A","Product designation":"Kommut.-Drossel f. Stromrichter","Protection class IP":"IP00","Inductivity rated value":"0.00014H","Power loss [W] of the coil":"434W","Operating voltage rated value":"380V","Ambient temperature rated value":"40°C","Operating frequency rated value":"50Hz","Power loss [W] of the iron core":"186W","Thermal class acc. to IEC 60085":"H","Type of electrical connection for main current circuit":"flat connector","Relative inductive drop in voltage on the measurement level current, voltage and frequency":"7.5%"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=295857&mlfb=4EU3921-0BE00-0A","alternativesUrl":"https://aoctrl.com/api/mcp/products/4EU3921-0BE00-0A/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/4EU3921-0BE00-0A","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/4EU3921-0BE00-0A when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}